code: def __init__(self, scalars, colormap, rng, opacity, name):
      self._scalars = scalars
      self._colormap = colormap
      assert rng is not None
      self._rng = rng
      self._opacity = opacity
      self._name = name
  
file_path: mne-python/mne/viz/_3d_overlay.py
imports: from collections import OrderedDict
  import numpy
  from ..utils import logger
label_desc: Use image node_id 1 to create a new _Overlay object  with example: obj = _Overlay(scalars, colormap, rng, opacity, name)